In Castle in the Sky, the girl who holds the crystal is Sheeta.
Sheeta is an orphan girl who is abducted because of the glowing crystal necklace she wears. The crystal is not merely jewelry: it is a magical levitation stone connected to Laputa, the legendary flying castle. Its power saves Sheeta when she falls from an airship and later helps guide her and Pazu toward the hidden island.
Sheeta is also the heir to Laputa's royal line. Her secret name, Lusheeta Toel Ul Laputa, links her directly to the ancient civilization that built the castle. Government agent Muska wants to use her knowledge and the crystal to gain control of Laputa's advanced technology.
The wrong options belong to other parts of the story. Pazu is the orphaned boy who helps Sheeta, Muska is the government agent pursuing her, and Dola leads the group of air pirates. Castle in the Sky was released in 1986 and was the first film animated by Studio Ghibli.